COVID-19 cases are once again rising across the U.S., with nearly half the country reporting increasing infections. California, Florida, and Texas are among the hardest-hit states, signaling a “summer wave” backed by wastewater surveillance data and CDC reports.While the virus was originally associated with winter peaks, health experts now observe a biannual pattern—resurgences during both summer and winter months. This evolving trend is being attributed to multiple factors, including waning immunity, the emergence of new variants, and behavioral patterns unique to warmer months.What’s Fueling the Summer Spikes?Summer spikes aren’t just a coincidence. The current surge is primarily being driven by:Fading immunity from earlier vaccinations or infectionsHighly transmissible variants, especially NB.1.8.1 (also known as the Nimbus strain), along with XFG and KP.3.1.1Increased indoor activity due to excessive heat and air conditioningLarge social gatherings, such as July 4th celebrations, barbecues, and summer travelExperts explain that during hot months, people seek comfort indoors in air-conditioned environments where poor ventilation raises the risk of airborne transmission. Add to that the travel and celebrations typical of summer, and it creates the perfect breeding ground for viral spread.Meet the New Variant: NB.1.8.1 (Nimbus)The most dominant strain at present is NB.1.8.1. First detected in March 2025, it’s known for causing a razor-like sore throat and spreading rapidly across 24–25 states. Though it’s not linked with more severe illness, its ability to bypass immunity has made it a major concern for public health officials.Other variants like XFG and LP.8.1, all Omicron descendants, have also shown up in wastewater, signaling widespread, albeit less severe, transmission.Is This Wave Milder Than Before?Fortunately, hospitalizations and deaths are still significantly lower than in previous pandemic waves. However, emergency room visits are increasing among young children, and those over 65, immunocompromised, or living with chronic conditions remain vulnerable.Also worth noting: long COVID continues to affect people even after mild infections, with lingering symptoms such as fatigue, brain fog, and shortness of breath.How to Stay Safe This SummerEven as cases rise, there are ways to protect yourself and your community. Here’s what experts recommend:Get vaccinated and boosted: Updated boosters are especially important for the elderly and immunocompromised. Don’t delay current doses while waiting for the fall rollout.Wear masks in high-risk settings: Opt for N95 or KN95 masks in crowded indoor spaces, airports, or around high-risk individuals.Test when symptomatic or after exposure: Keep rapid tests at home and isolate for at least 5 days if you test positive.Improve ventilation: Use fans, HEPA filters, and keep windows open when possible. Choose outdoor venues for gatherings.Practice hygiene: Wash hands often, sanitize surfaces, and stay alert to symptoms like sore throat, fever, and fatigue.